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Unique Observable
* Like Delegates.observable except it only calls the callback when the value actually changes.
public inline fun <T> uniqueObservable(initialValue: T, emitInitial: Boolean = false, crossinline onChange: (value: T) -> Unit): ReadWriteProperty<Any?, T> {
if (emitInitial) onChange(initialValue)
return object : ObservableProperty<T>(initialValue) {
override fun afterChange(property: KProperty<*>, oldValue: T, newValue: T) {
if (oldValue != newValue) onChange(newValue)
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